Mystery for mystery trading system.

Instead having it possible to get scammed. why not make a screen so that both players accept at same time making the gift go through. For instance, I want to trade with player B. I send a request. Player B has rp as well, he says yes. So they both use rp and gifts go to each person, making a pretty good system. I today got scammed by Disgraceful <--- (don't trust him.) But anyways i think this way would be more efficient and save a lot of arguments and stress.